add raw bindings for THNN

[stites]

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[AlejandroCatalina]

I've been working on this and I think I've made some progress. I note a few things regarding the code generator and THNN:

1. It iterates by default through all generic types, generating code for all generic types. I am not sure whether this is also the case for THNN or not (apparently it only generates Float types). We should note that this module has a different structure as the others (it has a single THNN.h, whilst the others have THDouble.h, THFloat.h, etc, and many .c files).
2. I've only worked so far on THNN (THCUNN is very similar, with new types).
3. I needed to add many new types to the generator to parse. Please check whether the style and place of the additions is okay.

You can see the commit in 990e994 . If you like the work so far (it is still wrong in so many ways, but I think it may be a work in progress in the right direction) and any of you has the time to help me out I can make a WIP PR so that everybody may help (probably @austinvhuang ?). There are tests missing and many things, but these are baby steps.

Next steps would include adding a type implementation to raw/src/types/TorchStructs.hs and raw/src/types/THTypes.hs, right?

In any case, I will keep working on this as I discover new things about the THNN module (it would be quite useful to start preparing some NN bindings, in the end is what everyone looks for).

Have I forgotten anything important? Do you have any useful pointers? Is this just wrong and I should remove the branch and move on to other things?

[stites]

@o1lo01ol1o -- you might be interested in some of the output files as well.

[AlejandroCatalina]

THNN bindings addressed in #65.

[stites]

closing this and opening up a new ticket for THCUNN bindings